import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

/**
 *  编写代码, 基于 Callable 实现 1+2+3+...+1000
 */
public class Demo2 {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        Callable<Integer> callable = new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                int count = 0;
                for (int i = 0; i <= 1000; i++) {
                    int k = i;
                    count += k;
                }
                return count;
            }
        };

        FutureTask<Integer> futureTask = new FutureTask<>(callable);

        Thread t = new Thread(futureTask);
        t.start();
        t.join();

        System.out.println("count: " + futureTask.get());
    }
}
